Siren.



H. C. HEATH.

SIREN. Y PPLICATION FILED JULY 13. |915.

. INVENTOR. l

ATTORNEY.

H. C. HEATH.

SIREN.

APPLICATION FILED IULY I3. 1915.

Batam-,Qd Aug. 28,1917.

2 SHEETS-SHEET 2.

v 1N VEN TOR. .YW

l A TTORNE Y.

' city and county of San Francisco and Statey UNITED STATES PATENT clarion. i

HARRY c. HEATH, or SAN FRANCISCO, CALIFORNIA.

SIREN.

Specification of Letters Patent.

Patented'Au'g. 28,1917.

Application mea my 13, 1915. serial No. 39,584.

To all whom it may concern.- Be it known that I, HARRY C. HEATH, a citizen of the United States, residing in the Referring to the annexed drawing' which forms a part of this specificationA Figure 1 is a vertical longitudinal sectional view of a siren embodying my inven tion with the air inlet and outlet valves open.

Fig.- 2 is a view similar to Fig. l with the air inlet and outlet valves closed.

Fig. 3 is a horizontal sectional view taken Fig. 4 is a horizontal section taken online t-a4 of Fig. 1 and looking upwardly.

Fig. 5 is a horizontal sectional view taken on line :v5-m5 looking downwardly.

The siren comprises a runner -1, inclosed within a casing 2, which casing is mounted upon a hollow base 3. Said casing consists ofa lower horizontal wall 4, vertical cylindrical wall '5, conical wall 6 which converges upwardly, vertical cylindrical bearing wall 7 and upper horizontal wall 8. The casing 2 is provided with a plurality of radialinletV openings 9 in the conical wall 6, through which air may enter the casing, and a plurality of circumferential openings 10 in the vertical cylindrical wall 5 through which the air which enters the casing through said inlet openings `may escape from the casing during the operation of the runner as will be hereinafter more fully disclosed. The runner 1 is mounted upon a vertical shaft 11 journaled in ball bearing y l2 within a hub 13 depending from the wall 4, the axis of said bearing and hub being in alinement with the bearing wall 7. The shaft 11 is coupled by means of coupling 14 to motor shaft 15 of motor 16 which is lmounted within the hollow base 3. The

runner 1 is provided with a central air inlet 17 throughwhich the air in the casing 2 enters the runner and a plurality of radial air passages 18 which communicate with said air inlet at their inner ends and are adapted to communicate successively with the outlets 10 in the vertical casing wall 5,

whenfthe runner is rotated, so that the air may escape intermittently from the runner through said outlets. An upwardly converging sound box 20 incloses and extends above the conical wall 6 and upper part of' the casing 2. The casing 2 is preferably formed in two separate sections, an upper and a lower section, the conical wall 6, vertical cylindrical wall 7 and upper horizontal wall 8 forming the upper section` and thevertical cylindrical wall 5 and lower horizontal wall 4 forming the lower section thereof. The sound box 20 is preferably formed integral with the upper section of the casing. The lowersection of the casing is vprovided with an annular horizontal flange 21 extending outwardly from the top of the vertical cylindrical wall 5, and the upper section of the casing is provided with an annular flange 22 extending outwardly from the sound box 20 which flange 22 is adapted to rest upon the flange 21 whereby the upper section of the casing and the sound box are supported upon the lower section of the casing. `Bolts 25 extend through Athe flange22 and screw into the flange 21 and detachably secure the upper section lof the casing and the sound box to the lower section of the casing. A trumpet 30 is detachably connected-to the top of thesound 'l box20 by means of flanges 31 and 32 on the top of the-sound `box and lower end of the trumpet respectively, and bolts 35 which extend through flange 32 and screw into flange 31. air inlet valve is provided for 'con--` trolling the feeding of the air tothe interior of the casing 2- and the runner 1. Said valve comprises the conical wall 6 and inlet openings 9 and a valve shutter 40 which rests within the casing 2 adjacent the conical wall 6. Said shutter is provided with radial openings 41 and radial closing members 42 adapted respectively to register with the inlet openings 9 to establish or shut off communication through the inlets between the sound box 20 and the interior of the casing 2 in the manner hereinafter more clearly described. An air outlet valve is provided for the escape ofair from the outer ends of the radial passage 17 of the runner 1 through the outlets 10. Said valve comprises the vertical cylindrical wall and its outlet openings and a shutter l50 which rests within the casing adjacent the wall 5. Said shutter comprises a plurality of openings 51 and a plurality of closing members 52 adapted respectively to register with said outlet openings 10 to establish or shut off communication of the outer ends of the runner passages 17 with thev atmosphere through the outlets 10 in the manner hereinafter more fully disclosed. The valve shutters 40 and 50 are preferably formed in one piece so that they may turn together and open-or close the inlets'9 and outlets 10 at the same time.` Arms. 55 depend from the shutter through slots 56in the lower horizontal wall 4 and are bolted by bolts 57 to the ends of a yoke 58 which is j ournaled on hub ljwhereby said shutters are journaled upon said hub. A cap 58X screws on the end of the hub 13, which closes the lower end of the hub and bears against the yoke 58 so as to hold the yoke properly on the bearing on said hub.- The conical shutter 40 hasl a trunnion 59 extending upwardly therefrom and journaled within the cylindrical bearing wall 7 whereby the shutters 40 and 50 are journaled in said bearing wall.

The trunnion 59 has a-top wall 60 provided with an opening 61 through which extends a bolt 65 which bolt vextends upwardly through and screws into a shutter end thrust bearing 66, which bearing extends through and screws into the upper end casing wall 8 and embossment 67 formed on Asaid casing'wall. The bolt 65 has a head 68 on its lower end between which and the upper trunnion wall 66 rests a coil spring 70, which spring tends Ito force the 'shutters upwardly and the shutter 40 against the conical valve casing wall 6. @ne end of said spring is connected to the trunnion top wall 60 and the other end is connected to the head 68 whereby the bolt 65 is prevented from turning except under considerable tension of theI spring. A nut 75 screws on the upp r end of the bolt 65 against the upper end of the end thrust bearing 66 by means of' which the bolt and head may be drawn upwardly and the upward pressure of the spring against the trunnion top wall 60 and the upward pressure of the shutters increased. The nut may be pinned to the bolt-65'by pin 7 6 so as to lock the spring 70 at its desired tension when so adjusted. A nut is provided at the' upper end of end thrust bearing 66 by means of which said bearing may be turned and screwed against or away from the trunnion top wall 60 so as to move the shutter 4() axially away from or toward the conical wall 6 and provide the proper t of the shutter 40 and conical wall 6 with relation to each other. The cap 58x is turned on the hub 13 to permit axial movement of the yoke 58, arms 55, shutters 50 and the axial adjustment of the shutter 40. A lock nut screws on the end thrust bearing 66 against the embossment 67, whereby said bearing may be locked to hold the shutter in its properly adjusted position. A conr nection is connected to the yoke 58 by means of which the yoke and the valve shutters 40 and 50 are oscillated on their bearings 7 and 13.

The operation of the siren is as follows:

The runner 1 is rotated by the motor 16 while the inlets 9 and outlets 10 are open, air from the atmosphere enters the upper open end of the trumpet 36 and passes through the inlets 9 into the casing 2 and through runner inlet 17 into the runner passages 18 and the centrifugal force created in said passages by the rotation of the runner forces the air in the' runner through said passages toward the circumferential casing wall 5 and out of the runner and casing 2 through outlets 10. The outflow of the air through the outlets 10 is intermittently interupted by the portions of the wall 5 between said outlets and during such outiow interruptions I of the air said wall portions reflect the siren sound out of the runner and casing 2 through runner inlet 17 and casing inlets 9 and thence through the trumpet 8O which magnifes the sound, and out of the upper open end thereof. Upon turning the shutters 40 and 50 so that the shutter closing members 42 and 52 close the inlets 9 and outlets 10 respectively the runner l is completely isolatedso that no air can enter the runner or pass therefrom. The isolation of the runner pr ventsV the siren from producing sound. @eg length of the slots 56 is such that when he arms 55 engage one end of the slots the shutter openings'41 and 51 register with the inlets 9 and outlets 10 and open the air inlet and outlet valves, and when the arms engage the other end of said slots the shutter closing members 42 and 52 register with and close the said inlets and outlets by oscillating the shutters upon their bearings the air inlets and outlets may be immediately opened and closed and the sound of the siren immediately produced at full blast or completely eliminated. .The interval of oscillation of said shutters determines the intervals of sound and the intervals of silence or the characteristic, of the siren.

I claim:

l. In a siren a runner, a casing inclosing said runner, a, conical inlet wall forming part of said casing, a conical air inlet valve shutter controlling the inlet in said conical inlet wall, an air outlet wall forming part of said casing, a valve shutter controlling the outlet in said outlet wall and means for adjusting'said inlet shutter axially with relation to said conical inlet wall.

2. In a siren a runner, a casing inclosing said runner, air inlet and outlet valves in said casing, a bearing upon which said inlet Valve is journaled, said casing provided with a, pair of slots, arms on the shutter of said outlet valve, projecting through said slots, a yokeconnected to said arms, and a bearing upon which said yoke is journaled.

3. In a siren a runner, a casing inclosing said runner, air inlet and outlet valves in said casing, a bearing upon which said inlet valve is journaled, said casing provided with a pair of. slots, arms on the shutter of said outlet valve projecting through said slots, a yoke connected to4 said arms, a bearing upon which said yoke is journaled, and means for adjusting the' shutter of said inlet valve and said yoke axially upon their bearings. Y

4c. In a siren a runner, a casing inclosing said runner, air inlet and outlet valves in said casing, a bearing upon whichsaid inlet valve is journaled, said casing provided with a pair of slots, arms on the shutter of said outlet valve projecting through said slots, a yoke connected to said arms, a bearing upon which said yoke is journaled, a nut screw- ,ing on the end of said yoke bearing and adapted to permit axial adjustment ot said yoke on said bearing and means for adjust- 'ing the shutter of said inlet valve and said yoke axially on their bearings.

5. In a siren a runner, a casing inclosingsaid runner, an inlet valve wall and an out-v let valve wall forming part of said casing, an inlet valve shutter and an outlet valve shutter controlling respectively the inlet and outlet of said inlet and outlet walls, a spring bearing axially against said inlet valve shutter and tending to urge said shutter axially toward said inlet valve wall, andnmeans for varying the tension of said spring.

6. In a sirenl a runner, a casing inclosing said runner, aninlet valve wall and an outlet valve wall forming part of said casing,

an inlet valve shutter and an outlet valve shutter controlling respectively the inlet andV outlet of said inlet and outlet walls, a spring bearing axially against said inlet 7. In a siren a runner, a casing inclosing said runner, an inlet valve wall, and an outlet valve-wall forming part of said casing, an inlet valve shutter and outlet valve shutter controlling respectively the inlet and outlet in said inlet and outlet walls, an end thrust bearing screwing into said cas ing against said inlet shutter and adapted to adjust said shutter away from said inlet wall, a bolt extending through and screwing into said end thrust bearing, a head on the inner end of said bolt, a spring between said bolt head and inlet shutter and a nut screwing on the outer end of said bolt against said end thrust bearing.

8. In a siren a runner, a casing inclosing said runner, an inlet valve wall andan outlet valve wallforming part of said casing, a bearing wall forming part of' said inlet valve wall, an inlet valve shutter and an outlet valve shutter for respectively controlling the inlet and outlet of said inlet and outlet walls, a hollow trunnion formed on said inlet shutter, an end wall extending across the upper end of said trunnion, and an end thrust bearing screwing into said casing against said trunnion end wall and adapted to adjust said shutter away from said inlet wall, a bolt extending through and screwing into-said end thrust bearing, a head on the inner end of said bolt, a spring between said bolt head and said trunnion end wall, and a nut screwing on the outer end of said bolt against said end thrust bearing.

9. In a siren a runner, a casing inclosing said runner, a conical inlet wall forming part of said casing, a conical air inlet valve controlling the -inlet in said inlet wall, an

sus

said hub and connected to said arms, a ball t bearing in said hub upon which said run` ner is journaled and a cap screwing on the end of said hub inclosing said ball bearin and bearing against said yoke.

l1. In a siren a runner, a casing inclosing Said runner, an air inlet valve journaled in outlet valve extending through said slots,

said casing, an air otlet valve in said casln testimony whereof, l have hereunto set ing adapted to operate With said inlet valve, my hand at San Francisco, California, this means for adjusting said inlet valve axially, 6th day of July, 1915.

said casing provided With slots, arms on said HARRY C HEATH a hub on said Casing, a yoke journaled on In presence ofsald hub and connected to said arms, and a ALAN FRANKLIN, cap sorewmg on said hub against said yoke. J osEPHlNE TUNIS. 

